about DNS mapping method
Bobo
rainbowave at yahoo.com
Wed Oct 4 01:44:29 UTC 2000
Hi, all.
As a DNS user, a BIND user, I have a question
about the current DNS mapping method. I am not
quite sure that my question is related to the
current DNS infrastructure or just based on the
BIND, the implementation.
Hence, I sent it here at first.
I hope somebody can drop me few lines on my
question. Thanks a lot.
My question is below.
As known, DNS is also a database system.
Then if we think about DNS based on database
relation, don't you think PTR and A have the
same meaning? a relation on address-&-name.
(not address-to-name, or name-to-address). Is
there any reason or advantage that cause DNS
need the direction on its database relation?
If we can creat A and PTR record as the same
record. Then it is abviously that we can reduce
the size of DNS database.
Furthermore, in the DNS cache, you will find
that:
though the server has a PTR record in the cache,
such like
52.0.0.10.IN-ADDR.ARPA IN PTR C.ISI.EDU
, when you query an A record for the domain name
C.ISI.EDU's, of course the server will have to
the nameserver who has the authority on the
domain "C.ISI.EDU". Why not using the PTR record
which already exists in the DNS cache?
In short, if DNS mapping method is bidirectional
, maybe DNS can work better. Of course, I do
think current mapping method should be used in
future.
Best Regards.
Bobo
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